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- Title
Cobalt-Doped K-OMS-2 Nanofibers: A Novel and Efficient Water-Tolerant Catalyst for the Oxidation of Carbon Monoxide.
- Authors
Yang, Jie; Zhou, Hao; Wang, Lei; Zhang, Yexin; Chen, Chunlin; Hu, Hualei; Li, Guozheng; Zhang, Yajie; Ma, Yuping; Zhang, Jian
- Abstract
Cobalt-doped manganese octahedral molecular sieves with an ordered cryptomelane structure (OMS-2) were synthesized by a one-step hydrothermal method. The cobalt precursor was directly added into the solution before crystallization to allow its incorporation into the mixed-valent framework of K-OMS-2. The structure, redox properties, and surface hydrophobicity of Co-doped K-OMS-2 were examined by X-ray diffraction, FTIR spectroscopy, Raman spectroscopy, SEM, TEM, N2 sorption, temperature-programmed reduction by H2, X-ray photoelectron spectroscopy, and water contact-angle system. The incorporation of Co induced a morphological change in K-OMS-2 from nanorods to nanofibers and an increase in the specific surface area from 70.6 to 188.3 m2 g−1. Co-doped K-OMS-2 was shown to be able to completely convert CO at 100 °C in the presence of approximately 3 % water vapor. The promotion effect of Co on the catalytic activity is believed to originate from the enhanced redox capacity and surface area of K-OMS-2, whereas the improved surface hydrophobicity may induce superior water-tolerant performance.
- Subjects
COBALT; HYDROTHERMAL synthesis; MANGANESE; X-ray diffraction; FOURIER transform infrared spectroscopy
- Publication
ChemCatChem, 2017, Vol 9, Issue 7, p1163
- ISSN
1867-3880
- Publication type
Article
- DOI
10.1002/cctc.201601681